In a player vs player local Commander game, I encountered a bug where Krow plays a Negate from hand to counter Brittany's Cast Out. When Krow cast the spell, it wouldn't let me tap his lands to pay for it, and when I pressed "Auto", it tapped two of Brittany's lands and attributed Brittany as the caster. The Negate, as seen in the screenshot, was then properly put into Krow's graveyard.